netdev - Re: [PATCH v3 bpf 2/2] selftests/bpf: extend map-in-map selftest to detect memory leaks

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Message-ID: <CAPhsuW795Y2YaRDy1mDMaF5DMdAUPjeqFdDJ97=JNo1AW0b4jw@mail.gmail.com>
Date:   Tue, 28 Jul 2020 13:54:31 -0700
From:   Song Liu <song@...nel.org>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Kernel Team <kernel-team@...com>,
        Song Liu <songliubraving@...com>, stable@...r.kernel.org
Subject: Re: [PATCH v3 bpf 2/2] selftests/bpf: extend map-in-map selftest to
 detect memory leaks

On Mon, Jul 27, 2020 at 5:32 PM Andrii Nakryiko <andriin@...com> wrote:
>
> Add test validating that all inner maps are released properly after skeleton
> is destroyed. To ensure determinism, trigger kernel-side synchronize_rcu()
> before checking map existence by their IDs.
>
> Signed-off-by: Andrii Nakryiko <andriin@...com>

Acked-by: Song Liu <songliubraving@...com>

With one last nitpick...

> ---
>  .../selftests/bpf/prog_tests/btf_map_in_map.c | 124 ++++++++++++++++--
>  1 file changed, 110 insertions(+), 14 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/btf_map_in_map.c b/tools/testing/selftests/bpf/prog_tests/btf_map_in_map.c
> index f7ee8fa377ad..2af1996df6f3 100644
> --- a/tools/testing/selftests/bpf/prog_tests/btf_map_in_map.c
> +++ b/tools/testing/selftests/bpf/prog_tests/btf_map_in_map.c
> @@ -5,10 +5,60 @@
>
>  #include "test_btf_map_in_map.skel.h"
>
> +static int duration;
> +
> +__u32 bpf_map_id(struct bpf_map *map)

nit: We can make this function static.